BRFplus: Error Message shown during After Import Processing

[] [] [] [] [] [] [] [] [] [] []

Symptom
While upgrading, during after import processing for BRFplus, the check for application name might return error messages of the following kind:
Invalid or no namespace in application name: &1SAP object &1 cannot be assigned to package &2
These messages should only be warnings during the after import processing.
Other terms
CL_FDT_APPLICATION, CHECK_NAME, FDT, BRFplus, FDT_AFTER_IMPORT, FDT_CORE212, TO142
Reason and [...]